The average of 50 numbers is 38. If two numbers 45 and 55 are discarded, the average of the remaining set of numbers is
38.5
37.5
37.0
36.5
292.
The average income of A for 15 days is Rs. 70. The average for first five days is Rs. 60 and that for the last nine days is Rs. 80 The income for the sixth day is
RS.80
RS.65
RS.50
RS.30
293.
The average monthly salary of a staff of 9 persons is Rs. 2450. One member of the staff whose monthly salary is Rs. 2650 transferred. Find the average salary of the remaining 8 persons of the staff.
RS .2445
RS .2425
RS .2675
RS.3025
294.
In a class of 20 students in an examination in Mathematics) students scored 100 marks each. 3 got zero each and the averag of the rest was 40. What is the average of the whole class?
40 marks
60 marks
none
option a
295.
Five years ago, the average age of P and O was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?
60yrs
50yrs
40yrs
30yrs
296.
A cricketer has a certain average for 9 innings. In the tenth inning, he scores 100 runs, thereby increasing his average by 8 runs. His new average is:
20 runs
24 runs
28 runs
32 runs
297.
A motorist travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is:
35
37
37.5
35.5
298.
The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:
39
39.7
40.3
42.7
299.
The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is:
4
8
16
32
300.
The average height of 30 boys out of a class of 50, is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is: